src/main/java/org/apache/commons/io/input/NullInputStream.java [144:208]:
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    @Override
    public void close() throws IOException {
        eof = false;
        position = 0;
        mark = -1;
    }

    /**
     * Handle End of File.
     *
     * @return {@code -1} if {@code throwEofException} is
     * set to {@code false}
     * @throws EOFException if {@code throwEofException} is set
     * to {@code true}.
     */
    private int doEndOfFile() throws EOFException {
        eof = true;
        if (throwEofException) {
            throw new EOFException();
        }
        return EOF;
    }

    /**
     * Return the current position.
     *
     * @return the current position.
     */
    public long getPosition() {
        return position;
    }

    /**
     * Return the size this {@link InputStream} emulates.
     *
     * @return The size of the input stream to emulate.
     */
    public long getSize() {
        return size;
    }

    /**
     * Mark the current position.
     *
     * @param readlimit The number of bytes before this marked position
     * is invalid.
     * @throws UnsupportedOperationException if mark is not supported.
     */
    @Override
    public synchronized void mark(final int readlimit) {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.mark();
        }
        mark = position;
        this.readlimit = readlimit;
    }

    /**
     * Indicates whether <i>mark</i> is supported.
     *
     * @return Whether <i>mark</i> is supported or not.
     */
    @Override
    public boolean markSupported() {
        return markSupported;
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src/main/java/org/apache/commons/io/input/NullReader.java [127:191]:
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    @Override
    public void close() throws IOException {
        eof = false;
        position = 0;
        mark = -1;
    }

    /**
     * Handles End of File.
     *
     * @return {@code -1} if {@code throwEofException} is
     * set to {@code false}
     * @throws EOFException if {@code throwEofException} is set
     * to {@code true}.
     */
    private int doEndOfFile() throws EOFException {
        eof = true;
        if (throwEofException) {
            throw new EOFException();
        }
        return EOF;
    }

    /**
     * Returns the current position.
     *
     * @return the current position.
     */
    public long getPosition() {
        return position;
    }

    /**
     * Returns the size this {@link Reader} emulates.
     *
     * @return The size of the reader to emulate.
     */
    public long getSize() {
        return size;
    }

    /**
     * Marks the current position.
     *
     * @param readlimit The number of characters before this marked position
     * is invalid.
     * @throws UnsupportedOperationException if mark is not supported.
     */
    @Override
    public synchronized void mark(final int readlimit) {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.mark();
        }
        mark = position;
        this.readlimit = readlimit;
    }

    /**
     * Indicates whether <i>mark</i> is supported.
     *
     * @return Whether <i>mark</i> is supported or not.
     */
    @Override
    public boolean markSupported() {
        return markSupported;
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